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How to install OpenShift Origin on CentOS-7

When I try to build a OpenShift Origin cluster, I noticed that it’s a bit hard to have an intimate knowledge of its installation. This post focused on this topic, and describes how to use openshift-ansible to install an Origin…

ELRepo has two types of Linux kernel package, kernel-lt and kernel-ml. What’s the difference between them?

How can I change the boot order in grub2? Here is a step by step guide, In a terminal type, # grep menuentry /boot/grub2/grub.cfg menuentry 'CentOS Linux (4.6.4-1.el7.elrepo.x86_64) 7 (Core) with debugging' --class rhel fedora --class gnu-linux --class gnu --class…

With the help of Linux hardware monitoring tool lm_sensor, we can get some hardware info from a running system. lm_sensor provides essential command line utilities to monitor hardware status of Linux.

In CentOS-7 / RHEL-7, Systemd uses “targets” instead of run-levels, and /etc/inittab is no more used by systemd to change run levels. When the graphic interface login is installed, we will use graphic mode by default. How can we disable the GUI login…

As we know, python has a module named SimpleHTTPServer can be used to create a web server in one line: $ python -m SimpleHTTPServer 80 How can we create an UDP server by Python? Here is a quick example:

An SSL certificate contains such information as: validity dates, subject, issuer and other stuff. It is a quite common task to check if an SSL certificate is valid and when it expires. We can easily use  Linux command line tools to retrieve all the information…

As we know, Zabbix has a list of processes to do different type of things. These are all kinds of Zabbix processes, and how busy they are. Starting with 1.8.5, following process types are available for monitoring:

In one of our former posts, we introduced how to use cpio to extract an RPM package. How can we create a cpio archive file? We can create a cpio archive that contains files and directories using cpio -ov. Examples, $…

We use pre-compiled binary files to install Go development environment on CentOS. This is very easy to follow, and all you need to do are, download the package, decompress it in a proper directory, and set system variables for Go. This guide…